[Bootstrapping] Introduce an accelerator to put a ChromeOS device into Slave OOBE process.

ui/login/display_manager.js

Index: ui/login/display_manager.js
diff --git a/ui/login/display_manager.js b/ui/login/display_manager.js
index 6338015c61b8887cb3fa2a449355368ddebd95af..4c7da664439c00b70898798a6d8be9ac1097854c 100644
--- a/ui/login/display_manager.js
+++ b/ui/login/display_manager.js
@@ -50,6 +50,7 @@
 /** @const */ var ACCELERATOR_APP_LAUNCH_BAILOUT = 'app_launch_bailout';
 /** @const */ var ACCELERATOR_APP_LAUNCH_NETWORK_CONFIG =
     'app_launch_network_config';
+/** @const */ var ACCELERATOR_BOOTSTRAPPING_SLAVE = "bootstrapping_slave";
 
 /* Signin UI state constants. Used to control header bar UI. */
 /** @const */ var SIGNIN_UI_STATE = {
@@ -384,6 +385,8 @@ cr.define('cr.ui.login', function() {
       } else if (name == ACCELERATOR_TOGGLE_EASY_BOOTSTRAP) {
         if (currentStepId == SCREEN_GAIA_SIGNIN)
           chrome.send('toggleEasyBootstrap');
+      } else if (name == ACCELERATOR_BOOTSTRAPPING_SLAVE) {
+          chrome.send('setOobeBootstrappingSlave');
       }
     },